build(deps): update pytest-celery requirement from <1 to <2

Updates the requirements on [pytest-celery](https://github.com/celery/pytest-celery) to permit the latest version.
- [Release notes](https://github.com/celery/pytest-celery/releases)
- [Commits](celery/pytest-celery@v0.1.0...v1.0.0)

---
updated-dependencies:
- dependency-name: pytest-celery
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -41,7 +41,7 @@ docs = [
 ]
 tests = [
   "pytest>=7,<9",
-  "pytest-celery<1",
+  "pytest-celery<2",
   "pytest-cov>=4.1.0",
   "pytest-mock",
   "pytest-rerunfailures",